feat(pickers): custom results height for centered layout

doc/telescope.txt

@@ -2239,6 +2239,7 @@ layout_strategies.center()                         *telescope.layout.center()*
 
     `picker.layout_config` unique options:
       - preview_cutoff: When lines are less than this value, the preview will be disabled
+      - results_height: Optional height specifically for results window
 
 
 layout_strategies.cursor()                         *telescope.layout.cursor()*

lua/telescope/pickers/layout_strategies.lua

@@ -431,6 +431,7 @@ layout_strategies.center = make_documented_layout(
   "center",
   vim.tbl_extend("error", shared_options, {
     preview_cutoff = "When lines are less than this value, the preview will be disabled",
+    results_height = "Optional height specifically for results window",
   }),
   function(self, max_columns, max_lines, layout_config)
     local initial_options = p_window.get_initial_window_options(self)
@@ -520,6 +521,17 @@ layout_strategies.center = make_documented_layout(
       preview.line = preview.line + 1
     end
 
+    -- set the height of the results window if specified
+    if layout_config.results_height then
+      local diff = results.height - resolve.resolve_height(layout_config.results_height)(self, max_columns, max_lines)
+      results.height = results.height - diff
+      results.line = results.line + diff
+      preview.height = preview.height + diff
+      if layout_config.prompt_position == "top" then
+        prompt.line = prompt.line + diff
+      end
+    end
+
     return {
       preview = self.previewer and preview.height > 0 and preview,
       results = results,